Bicycle frame



FIG. 1 is a perspective view of my bicycle frame design;

FIG. 2 is a front view of my bicycle frame design, enlarged for clarity;

FIG. 3 is a left-side view of my bicycle frame design;

FIG. 4 is a top view of my bicycle frame design;

FIG. 5 is a back view of my bicycle frame design, enlarged for clarity;

FIG. 6 is a right-side view of my bicycle frame design; and,

FIG. 7 is a bottom view of my bicycle frame design. 

The ornamental design for a bicycle frame, substantially as shown and described. 